This page describes how to use coreboot on the [http://www.gigabyte.com/products/product-page.aspx?pid=3274 GIGABYTE GA-MA785GMT-UD2H] mainboard.

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This board exists in 4 versions: v1.0, v1.1, v1.3 and v3.3.

This board exists in 4 versions: v1.0, v1.1, v1.3 and v3.3.

This documentation applies to [http://www.gigabyte.com/products/product-page.aspx?pid=3274 v1.1]. If you have a different version of the board, YMMV.

This documentation applies to [http://www.gigabyte.com/products/product-page.aspx?pid=3274 v1.1]. If you have a different version of the board, YMMV.

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==Dual BIOS==

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== Dual BIOS ==

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This board has a dual bios chip. Both chips are 8Mbit; the main bios is called M_BIOS, the backup bios B_BIOS. Gigabyte claims the backup bios can not be flashed by the user. It contains code that will overwrite M_BIOS if it determines that M_BIOS is corrupted.

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This board has a dual BIOS chip. Both chips are 8Mbit; the main BIOS is called M_BIOS, the backup BIOS is called B_BIOS. GIGABYTE claims the backup BIOS can not be flashed by the user. It contains code that will overwrite M_BIOS if it determines that M_BIOS is corrupted.

The M_BIOS chip is a [http://www.mct.net/download/macronix/mx25l8005.pdf Macronix MX25L8005].

The M_BIOS chip is a [http://www.mct.net/download/macronix/mx25l8005.pdf Macronix MX25L8005].

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If you flash coreboot into M_BIOS and something goes wrong, you can force B_BIOS to boot and reflash M_BIOS by bridging pins 4 (GND) and 7 (#HOLD) on the M_BIOS chip, powering up the machine, and then releasing your bridge after a few seconds. The B_BIOS will take over at that point - you will hear a beep, and see the B_BIOS boot and forcibly re-flash M_BIOS.

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If you flash coreboot into M_BIOS and something goes wrong, you can force B_BIOS to boot and reflash M_BIOS by bridging pins 4 (GND) and 7 (#HOLD) on the M_BIOS chip, powering up the machine, and then releasing your bridge after a few seconds. The B_BIOS will take over at that point &mdash; you will hear a beep, and see the B_BIOS boot and forcibly re-flash M_BIOS.

Revision as of 17:31, 7 November 2010

This documentation applies to v1.1. If you have a different version of the board, YMMV.

Dual BIOS

This board has a dual BIOS chip. Both chips are 8Mbit; the main BIOS is called M_BIOS, the backup BIOS is called B_BIOS. GIGABYTE claims the backup BIOS can not be flashed by the user. It contains code that will overwrite M_BIOS if it determines that M_BIOS is corrupted.

If you flash coreboot into M_BIOS and something goes wrong, you can force B_BIOS to boot and reflash M_BIOS by bridging pins 4 (GND) and 7 (#HOLD) on the M_BIOS chip, powering up the machine, and then releasing your bridge after a few seconds. The B_BIOS will take over at that point — you will hear a beep, and see the B_BIOS boot and forcibly re-flash M_BIOS.